Add a new public library libicu.so

Bug: 160350521
Test: atest CtsJniTestCases
Change-Id: I9693dc225d2ccbdd55b5e609250534e541aaeb75
diff --git a/rootdir/etc/public.libraries.android.txt b/rootdir/etc/public.libraries.android.txt
index 5de422f..967205f 100644
--- a/rootdir/etc/public.libraries.android.txt
+++ b/rootdir/etc/public.libraries.android.txt
@@ -10,6 +10,7 @@
 libGLESv1_CM.so
 libGLESv2.so
 libGLESv3.so
+libicu.so
 libicui18n.so
 libicuuc.so
 libjnigraphics.so